NORTH amf;rican odonata. 257 



Abundant around Phila., June 3— Aug. 8 ; 1 S , Sept. 10, 1891 ; 

 ovipositing or in copula June 24, July 4. 



Massachusetts to Virginia (Beutenmiiller, Richardson). 



N. B. — Libellula flavida Hagen (Syn. Neur. N. A., p. 156), not of Eambur, dif- 

 fers from phimbea and cyanea in having no dark brown basal streak to the wings : 

 the apex of the wings in both % and 9 is barely edged with brown ; pterostigma 

 most like that of cyanea. Abd. % 33.5-36, 9 31-33. H. w. % 41-43, 9 40-41.5. 

 Texas. The flavida of Eambur (Ins. Nevr. p. 58) is diflferent from flavida Hag. 

 and may perhaps be identical with plumbea. These three forms are closely allied. 



liibelliila axillena Westwood. 



L. a. Westwood's edit, of Drury, 111. Exot. ii, p. 85, pi. 47, fig. 1, 1837. L. lydia 

 Drury, I. c , 1773. L. a. Duncan, Introd. p. 292, pi. 29, fig. 1, 1840. Hagen, Syn. 

 Neur. N. A., p. 156, 1861. 



Inner margins of lateral labial lobes blackish. Thoracic dorsum reddish brown, 

 a mid-dorsal stripe and sides yellow ; a mark on second lateral suture and some 

 near coxse, blackish brown. Abdomen yellow, sides of 1-3, sutures and a mid- 

 dorsal stripe on 2-10, blackish. Wings with a basal streak between subcosta and 

 median to beyond the level of the arculus, a nodal dot, a streak confined to the 

 first postcubital series, and the extreme apex, blackish brown. Pterostigma 

 blackish. 



% . Anterior surface offrons and clypeus, labrtim, black ; frons above metallic blue. 

 Thorax and abdomen blue pruinose in old males. 



9 . Frons reddish or yellowish, above metallic blue ; nasus pale green or yellow. 

 rhinarium and labrum partly or entirely black. 



Abd. % 37-42, 9 37-38.5. H. w. '^ 41-45, 9 42-42.5. 



Georgia, Florida, Louisiana. 



49. form Tibraiis (Fabricius?) Kirby, Cat. Odon. p. 29, 1890. L lydia Hagen, 

 Syn. Neur. N. A., p. 155, 1861. 



Difiers from axillena as follows : frons, clypeus and labrum tvhite, pale green, or 

 yellow. Usually no brown streak on first postcubital series. 



Abd. I, 37-42, 9 37-38.5. H. w. % 47-50, 9 45-47. 



One male, June 10, Phila., S. F. Aaron (A. E. S.). One male, 

 July 5, 1890, one female, July 3, 1893, Ridley Twp., Del. Co., Pa., 

 P. P. Calvert (C). 



Pennsylvania and New Jersey to Texas. 



form incesta Hagen, Syn. Neur. N. A., p. 155, 1861; Psyche v, p. 384, 1890. 

 Calvert, Trans. Am. Ent. Soc. xvii, p. 34, 1890. 



Differs from axillena as follows: % . Wings usually unspotted, sometimes with 

 a small nodal spot. Labrum yellowish, face black, frons above dark metallic blue, 

 in old males. 9 • Wings with the basal streak usually very short, extreme tips 

 not always brownish, other wing spots wanting. Face yellowish, frons above brown- 



Abd. % 33-39, 9 31-34. H. w. % 37-40, 9 37.5-39. 



Canada to Florida (Hagen). 



TKANS. AM. ENT. SOC. XX. (33) SEPTEMBER. 1893. 



